EP 0192426 A2 19860827 - Removal of sodium ions from alkaline aqueous solutions by means of an electrolytic membrane process.
Title (en)
Removal of sodium ions from alkaline aqueous solutions by means of an electrolytic membrane process.
Title (de)
Entfernung von Natriumionen aus wässerigen alkalischen Lösungen durch ein elektrolytisches Membranverfahren.
Title (fr)
Extraction d'ions sodium de solutions alcalines aqueuses au moyen d'un procédé électrolytique à membrane.
Publication
Application
Priority
ZA 851119 A 19850214
Abstract (en)
A method of removing sodium ions from an alkaline aqeuous solution such as a leach solution which contains dissolved sodium tungstate. The method involves passing the solutions through the anode compartment of an electrolytic cell and passing an electrical direct current through the cell causing the sodium ions to pass through the cation selective membrane and tungstic acid to be produced in the anode compartment. Sodium-containing alkali is bled from the cathode compartment at a rate sufficient to prevent build-up of alkali in the cathode compartment. The tungstic acid is typically converted to ammonium tungstate by treatment with ammonia and then the ammonium tungstate further treated for recovery of the tungsten values.
IPC 1-7
IPC 8 full level
B01D 61/00 (2006.01); B01D 61/44 (2006.01); B01D 61/54 (2006.01); B01D 65/00 (2006.01); B01D 65/08 (2006.01); C01G 41/00 (2006.01); C25B 1/00 (2006.01); C25B 1/22 (2006.01); C25B 15/08 (2006.01)
CPC (source: EP US)
B01D 61/44 (2013.01 - EP US); C01G 41/00 (2013.01 - EP US); C25B 1/22 (2013.01 - EP US)
Designated contracting state (EPC)
AT FR GB SE
DOCDB simple family (publication)
EP 0192426 A2 19860827; EP 0192426 A3 19880921; AU 5342286 A 19860821; AU 571368 B2 19880414; JP S61235586 A 19861020; JP S6254875 B2 19871117; US 4654131 A 19870331; ZW 2786 A1 19860514
DOCDB simple family (application)
EP 86301007 A 19860213; AU 5342286 A 19860212; JP 3060086 A 19860214; US 82959586 A 19860213; ZW 2786 A 19860210